Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a819796eb5f781…

MALICIOUS

PDF

105.3 KB Created: 2021-08-15 20:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f798dfe15887e8beaa7861eab096512b SHA-1: f985caf81b5ded36eb64b1924d5eea1576167d84 SHA-256: e9a819796eb5f781f04d9bc21d252ad9c810a2b45e0935699712c8f7061f43db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content, aiming to redirect users to harmful destinations. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=reg%C3%AAncia+nominal+-+exerc%C3%ADcios+recanto+das+letras PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/877ee0094a0745f33dea2ec5cb13b031/30629073137.pdfIn PDF document text
    • http://capri.lt/userfiles/files/joloregexigeratokilox.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/sanuxetusuragezufuzujak.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xiwikonukekixabufogiwa.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nutolefumewudejobajukena.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a75064dbb---87805646710.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/97037507547.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106260434495502.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kimunorajutanebewu.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/mikuxiputinu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1feb82fc8a---jupivetaxujux.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/zopumugojaxuboruruwuzelaz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41f5ca31b---lidilekelipefepelojedimo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a8227d2429dddbafc079abe486c0375c/42064154626.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/af3r19kajf4v5oa9cregghrlb7/powokupeget.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6pvp2c65hd1uohkndcaap5jato/79717260025.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/15378401021.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/61690924245.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/30578122946.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67759253378.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5625ab2666df40c7178dd14dfa904aa9/dofijuxegejogixet.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/lovipoweputeriguwezij.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 11116 bytes
SHA-256: 78e5c9836b028b98ff32037a218482ec33540e54ec5a888ab3481ededc9ba913
font_01_sfnt_off00014b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 19884 bytes
SHA-256: 74ef50df61b20f071587eee49ea26df16629e53dcf2f00be9df3be7c93021f76
font_02_sfnt_off00017c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.